Traveling grate



June so, 1925' Y 1,544,399

H. B. HOLT TRAVELENG GRATE Filed Jan. 19, 1924 2 Sheets-Sheet 1 FIE.I- 4 3 3 FIE-5.1!- FIELY- 4 mlvewro/f WIT/V5965 5 June 30, 1925. 1,544,399

. H. B. HOLT TRAVELING GRATE v filed Jan, 19, 1924 2'Sheets- -Sheet 2 i 'Zvvsy'roe WITNESSES I 2 WW ,3- M .%aialfia 4. 4 Maw J 3.

Patented June 30, 1925.

UNITED STATES PATENT oFFlcE.

HARRIS B. Hour, on nomvronr, PENNSYLVANIA, nssrenoa TO nosEnALnroUnnaY 1 AND MACHINE COMPANY. OF PENNSYLVANIA.

PITTSBURGH.

PENNSYLVANIA, a oo nrona'rron or TRAVELING er RATE.

Application filed January 19, 1 924. Seria1 No, 687,248.

To all whom it may concern; 7

Be it known that LHanms B. HOLT, residing at Dormont, in the county of Allegheny and State of Pennsylvania, a citizen of the United States, have invented or dis covered certain new and useful Improve-' ments in Traveling Grates, of which 1m' provements the following is a specification.

My invention relates tOilTlPIOVQHlBIltS in the structure of traveling ticularly to traveling grates of the endlesschain type whereon fuel is continuously supplied to the combustion chamber of a furnace and whereon the iii-brought fuel is within the combustion chamber continuously consumed.

I have developed my lnvention 1n application to a chain-grate of the particular form shown in Letters Patent of the .United States,'No. 1,476,337, granted me December i, 1923, and in that application I shall show and describe it. f

The structure in'which my inventionis found is illustrated in the vaccompanying drawings. Fig. I is a fragmentary view in plan from above (certain details appearing in horizontal section) of the gratestructure. Fig. 11 is a view in vertical and longitudinal section, showing .a portion of the grate structure in its assembly with the roller which sustains it. Fig. 111 is a detail view to larger scale, showing in side elevation the component elements of the grate structure in articulation together. is a view in vertical and transverse section,

on the plane indicated by the line IVIV,'

Fig. III. Fig. V is a view of assembly in end elevation. view similar to Fig. IIIv the gratebar Fig. VI is a (though to smaller.

scale) illustrating a modification in the structure.

The grate shown in Figs. I-V is the grate of my patent referred to above, in that it' consists of a belt made up of a plurality of identical links assembled in rows and in echelon formation, and articulated upon rods threaded through eyes with which the links at their opposite ends are provided. Each link is formed medially with a T-shaped extension, and in the assembly these T- shaped extensions come into alignment and, extending in substantial continuity across the grate structure, form supports upon which the grate bars themselves are strung.

The links are indicated in the drawings by grates, and par-.

Fig. v

the reference numeral 1; the rods ,upon which the rows of links in echelon-formation are 'p'ivotally united are indicated at 2. 3 are the T-shaped extensions upon the links, and l-'are the grate-bars which are strung in rows upon the transverse supports'constituted by the T-shaped extensions.

So far as concerns ventilation through the assembled links, the structure is that of my patent, and will beunderstood on consider- .ing Fig. IV of the drawings, As there seen, the grate bars are, intermediate their length, spaced apart. Termlnally, however,

the square ends' of the grate bars when as sembled present substantially continuous surfaces transversely of the'g'rate, This particularly appears in Fig. V."

My present invention is found in provision, in such a grate'as Ihave'indicated,

of means for catching the ashes, as the grate at its advance end rounds thesplrocket wheels or pulleys'which carry andpropel' it,'means which prevent the ashes from falling through, to foul and clog the struc ture, and which insure the eventual dischargeof the ashes "in a direction, not through the structure, but from'the place of lodgment outwardly and away from the structure as a whole.

ieferring' particularly to drawings, the endless grate structure isthere shown tobe carried upon a roller 5, which roller is mounted on a shaft 6. At the opposite end the grate structure will be understood to be supported on and driven'by sprocket wheels. It will be understood that in place of the roller 5 sprocket wheels might be provided at this end of the grate also. The direction of movement is in ig. ll'indicated by an arrow. And it will be perceived that, whereas along the level upper course the grate-bars stand end to end inclose array, with narrow intervals between. as they round the roller, spaces 8 open between the ends of the bars. Into these spaces ashes necessarily fall, and the object which I have in view is to prevent the ashes which fall into these spaces from passiiig through and filling and clogging the spaces between the links and beneath and between the grate bars. 7 I I so shape the links that they are provided with surfaces which in the assembly come into substantially continuous alignment acrossthe width ofthe grate and form Fig. 11' of the 3 bottorns for the spaces which as the grate rounds the sprocket-wheels, open between the rows of grate-bars. These spaces then between the rows of grate-bars become pockets, inwhich the ashes which fallare-re tained, and prevented from falling through. As inthe further travel of the gratethese pockets are inverted, they discharge their. contents, but they then discharge their contents outwardly in a directionv away from the grate structure.

Specifically,

the ends. of the grate bars are square} and throughout the fuel supporting,reach of the grate-these square ends o fsuccessiverotvs} of grate-bars (which present substantially: con- I tlnuoussurfaces, as noted above) stand opposite one another, and with spaces'between,

which may in 'the building oflthe grate be reduoedto' negligible Width. As in .operation these; links round the roller 5v these spaces between therows: ofbars iden to approxiniate'lyrvzshaped spaces, with geo- Jnetric centerfi uthefax is of the articulation rods 2,; ,Thefsurfaceis with which thelinks are providedfand'vvhic-h as the links round are. themselves,indicatedat 12. They are in.

grate.

the roller come iritolcontinuous alignment,

their arrangement concentric With eyes through which; the articulation rods 2 I exs tendlQ These surfaces 12 are soplaced that as tlierowsgof,.linlislturn ingrounding the roller, row relativelyt0 Crow, they (the said.

surfaces) extend insubstantial continuity across the ,width ,of the grate, and underlie and lform l the bot-toins of the pockets -which open betvveenth'e rows, of grate-bars. The;

grate bars themselves, as has been noted, are

preferably so; particularly shaped that the sidev Walls of these .Vfshapedpockets aresubstantially continuous transversely offth'e articulated structure as this, Whose links are made of castironzand Which in service is subjected to .Wide ranges of temperature, to reduce torelat'ively:small' eXtent the vertical surfaces over. Which. the adjacent links in the row abut laterally, link against link; VVitln this; consideration I in mind, the eyes formed atopposite ends of the links are en-; circled with bosses 11 Whose vertically dis-u.

posed"faces,,'as Will be perceived, are relatlvely narrow. ThlS structure affords nornally discontinuityfof link; surface from side toflside', across thestructu-re. Iso far 5 depart from, the practice indicated as to across the width of thegQrate. .T Referriiig to Fig, to the link ontheleft, Which here appears .Widen throughout a portion of its CllO'LllD ferential extent-the vertically disposed face of the boss and so provide, transverse surfaces Wl11 Cl1 as the structure rounds the roller, 5" extend insubstantial contin uity III, and particularly assh wn-in,ri s. Hand. m.

s ggoodj engineering practice in suchan;

in its entirety ingside' elevation, it mube perceived that the bosses 11 are widened and the transverse surfaces of the link are widened on upper side o'f the link, ou

the same side-that-is ftosay zw it-h the T-' shaped extension 3. These' wrdened surfaces 12 are arranged, one. on either side of the ex- ,tension .3,-.an.,d they: .lie. to left and to right of i'vertical planes extending through the centers of pivotal turning of the. links, roW- upon row}; -Understandiiig thatjthe left hand'jends of thjelinjks of oneroware pivot i i edftothe right-.handjends o'ftlielinks oftlre next, adj acent 1 'oW,;.itI svillfbe j perceived that, throughout the level'reachjof grate travel these surfacesll2jof adjacent .rowsare more or.less completely out. .of alignment, but that as. the .linksfswing on theiiifpivots in roundinlg thesprocklts, these surfaces 12joffad-- j acent; rows of .1 interengagedflinks coine'.to. alignment. and present substantially con tinueus surfaces of jproperfextent across the scribed). i a V V The assembly and "its functioning ;are best width .offthe structure, to serve {the ends de-i illustrated inFig. II. As the spaces 8 Widen,

rows of; links come into alignment and un-v derlie spaces. and formbottom f pecker ashes and:"'prevent further descent to the pac w h n- Thesej pockets hold theinfalfi'ng 5 the surfaces ;1 2jof j'adjacent and interpivoted' As ,the grate advancesthe pockets,avhichinitially were rightside up.

turn up, sideldownand the ashes'spill from them, but indirection away from the grate structure. i a

" The modifications shown iii- Fig .VI' lie in these featuresgFi'rst, the links 'lfinstea'd'. of g-be'ing' provided with F-shaped "extensions are provided withi'pairs of opposite .conver gent, extensions '3 the grate-bars 4*, in

stead offjbeiiigjprovided"with recesses are provided With""'l"f-shaped' extensions, by; means of Whichthe fgrate -bars are strung: in rows into the grooves formed transversely of the grate structure by the assembled links. i

of Fig. IIIr the extensions 3 of each" row form substantially continuous supports.

Third, the surfaces Marel not, it will be perceived, concentric with the axis ofpivo'tal Second, the surfaces} 143-51 5 conveniently movement between rows of links, but as the structure rounds the pulle'y these surfaces 14:.

still," as in the case'firstdescrih'ed, cooperate rao with the end walls of the next forwardly adjacent row of grate-bars to form ash-receiving pockets. are gained.

it will be observed of the pockets which open between the grate bars both that they are approximately V-shaped, as has already been explained, and that they are closed pockets. Ashes can escape neither forwardly nor rearwardly through them to the inner part of the structure. In consequence of the essentially V-shape of these pockets with flaring walls, my grate will keep itself clean under these conditions. It sometimes happens th through iii-attention ashes which fall through the grate are allowed to accumulate beneath and to form a heap, through the top of which the moving grate keeps ploughing its way. clince the pockets which open between the grate bars in the curved portions of the pathway of the grate are flaring and substantially closed at the bottom both rearwardly and forwardly (with respect to the direction of normal advance), my grate does not pick up ashes in case it has to plow through a heap and does not under such conditions become fouled.

Itsometimes is necessary in making repairs upon a grate to reverse its travel. In such circumstances the fact that the space is closed rcarwardly is of great advantage, because under such conditions the green coal, instead of falling through to clog the structure, merely rests in a pocket, from which it will either discharge itself or from which the attendant my easily remove it.

I claim as my invention:

1. In a chain-grate structure, an endless chain grate traveling in round-ended course and consisting of a plurality of links arranged in transverse rows and articulated for pivotal movement row relatively to row, and grate-bars carried by the rows of links,

the said grate-bars being provided with square ends which when the bars are assembled upon the rows of links form substantially continuous surfaces transversely of the grate, the successive rows of gratebars swinging one relatively to another as the grate rounds the ends of its course whereby substantially V-shaped spaces are opened between successive rows of grate-bars, the said links being provided with surfaces which elsewhere out of alignment come to alignmentas the grate rounds the ends of its course and form continuous bottoms for the spaces which open as aforesaid between the ends of successive grate-bars.

In a chain-grate structure an endless chain-grate advancing in round-ended course. the said grate consisting of a plurality of rows of links pivoted row to row And the same desired ends grate-bars borne by said links in successive.

rows; the rows of grate-bars standing in close succession throughout a portion of the course of grate travel and separating as the grate rounds the? ends of its course with substantially V-shaped spaces between, the said links being provided with anterior and posterior surfaces which as between adjacent rows stand normally out, of alignment but which throughout the rounded ends of the course of grate travel stand in alignment and afford transversely of the structure a bottom to the space which opens between the rows of grate-bars.

3. A chain grate composed of links hav ing overlapping ends articulated in a succession of rows and advancing inw roundended path, the rows of links carrying a succession of grate bars between which as the structure rounds the ends of its pathway spaces open, each link being of elongate form and provided adjacent its ends with transverse eyes whereby articulationis effected, the said eyes being encircled by annular bosses upon the sides of the links, the said annular bosses throughout a portion of their extent being widened to the edge of the link, and the widened portions of the;

bosses being so situated that as the chain grate rounds the end of its pathway the widened faces of said overlapping ends of the links come to alignment and form continuous bottom surfaces for the spaces opened as aforesaid, between successive grate bars. v

4-. In a chain-grate structure, an endless chain grate traveling in round-ended course and consisting of a plurality of links arranged in transverse rows and articulated for pivotal movement row relatively to row, and grate-bars carried by the rows of links,

the said grate-bars being provided with square ends which when the bars are assembled upon the rows of links form substantially continuous surfaces transversely of the grate, the successive rows of gratebars swinging one relatively to "another as the grate rounds the ends of its course whereby spacesare opened between successive rows of grate-bars, the said links being provided with surfaces which as the grate rounds the ends of its course form bottoms for the spaces which open as aforesaid between the ends of successive grate-bars.

In testimony whereof I have hereunto set myhand.

HARRIS B. HOLT.

\Vitnesses Pnnor A. ENGLISH, FRIEDA E. News ORRIEN. 

